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Finding the Fourth Proportional to 13.44, 20.21 and 7.75

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Solution

The fourth proportional to 13.44, 20.21 and 7.75 is: 11.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.44 : 20.21 = 7.75 : x
  2. Step 2: Convert to fraction form
    13.44/20.21 = 7.75/x
  3. Step 3: Cross multiply
    13.44x = 20.21 × 7.75
  4. Step 4: Simplify right side
    13.44x = 156.50
  5. Step 5: Solve for x
    x = 156.50/13.44
  6. Step 6: Final answer
    x = 11.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.